NFS: Enable NFSv4 callback server to listen on AF_INET6 sockets

Allow the NFS callback server to listen for requests via an AF_INET6 or
AF_INET socket when IPv6 support is present in the kernel.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 6a09760c5960..c2e9cfd9e5a4 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -40,6 +40,16 @@ unsigned short nfs_callback_tcpport;
 static const int nfs_set_port_min = 0;
 static const int nfs_set_port_max = 65535;
 
+/*
+ * If the kernel has IPv6 support available, always listen for
+ * both AF_INET and AF_INET6 requests.
+ */
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static const sa_family_t        nfs_callback_family = AF_INET6;
+#else
+static const sa_family_t        nfs_callback_family = AF_INET;
+#endif
+
 static int param_set_port(const char *val, struct kernel_param *kp)
 {
         char *endp;
@@ -106,7 +116,7 @@ int nfs_callback_up(void)
         if (nfs_callback_info.users++ || nfs_callback_info.task != NULL)
                 goto out;
         serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE,
-                                AF_INET, NULL);
+                                nfs_callback_family, NULL);
         ret = -ENOMEM;
         if (!serv)
                 goto out_err;
@@ -116,7 +126,8 @@ int nfs_callback_up(void)
         if (ret <= 0)
                 goto out_err;
         nfs_callback_tcpport = ret;
-        dprintk("Callback port = 0x%x\n", nfs_callback_tcpport);
+        dprintk("NFS: Callback listener port = %u (af %u)\n",
+                        nfs_callback_tcpport, nfs_callback_family);
 
         nfs_callback_info.rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
         if (IS_ERR(nfs_callback_info.rqst)) {
@@ -149,8 +160,8 @@ out:
         mutex_unlock(&nfs_callback_mutex);
         return ret;
 out_err:
-        dprintk("Couldn't create callback socket or server thread; err = %d\n",
-                ret);
+        dprintk("NFS: Couldn't create callback socket or server thread; "
+                "err = %d\n", ret);
         nfs_callback_info.users--;
         goto out;
 }